May 21, 2016
Screen space reflection: fallback cubemap
There is a big change when screen space ray tracing can’t hit any visible pixel on the screen buffer (especially when you look straight at the reflective surface). In my shader, no pixel will be sampled at this point. A better way is to sample from a cubemap as a ‘fallback’ reflection.
(Screen space reflection without fallback cubemap)
(Screen space reflection with fallback cubemap)
Usually, the result can be improved by rending the environmental cubemap and apply as fallback cubemap. A good cubemap can make up the limitation of screen space reflection about missing sampling..
